Thermostatic radiator valve



J. V. GIESLER THERMosTATIc RADIATOR VALVE Filed OCT.. 19, 1953 March 2, 1937.

Patented Mar. 2, 1937 PATENT OFFICE rnnl'mos'rarrc nAnrA'ron VALVE Jean V. Gie'sler, Knoxville, Tenn., signor to '111e Fulton Sylphon Company, Knoxville. Tenn., a corporation of Delaware Application October 19, 1933, Serial N0. 694,333

y 12 Claims.

'I'his invention relates to temperature regulators, and particularly regulators of the character which employs 'a motor vessel subjected to a source of heat and constituting a vaporizing chamber for a liquid supplied thereto from a container for said liquid subjected to the controlling temperature.

It is an object of this inventionv to provide an improved container for the vaporizable liquid to be subjected to the temperature of the ambient.

Another object of this invention is to provide a device of the type characterized with improved means for adjusting the response at the container for the vaporizable liquid subjected to the temperature of the ambient.

Another object of this invention is to provide a device of the type characterized with improved means for subjecting the vaporizable liquid to the temperature of the ambient and including readily adjustable means for predetermining the temperature to be maintained.

Another object of this invention is to provide an improved device of the type characterized which includes a container for the volatile liquid that is so constructed, arranged and mounted that the desired sensitivity of response can be obtained by use of a relatively compact unit that can be readily installed at any suitable location and which will accurately vary the amount oi' vaporizable liquid supplied for vaporization in the motor vessel in conformity with the fluctuations of temperature at said location.

' Another object of this invention is to provide a device of the' type last characterized with improved means for predetermining the temperature to be maintained thereby.

Another object of this invention is to provide a device of the type characterized with a relatively long communicating tube between the motor 40 vessel and the container for the vaporizable liquid,

so that the device may be standardized and include suillcient tubing to permit the container for the vaporizable liquid to be positioned as remote from the motor vessel as is likely to be desirable in practice, and which at the same time has provision for compactly storing any excess length of tubing when the container is to be located at a point less remote from the motor vessel than the maximum provided for.

Another object of this invention is to provide a device of the type characterized which is particularly designed for use with high pressure steam as the heating medium, and wherein the motor vessel is so disposed with respect to the passages containing high pressure steam that the proper temperature is maintained at said vessel.

Another object of this invention is to provide an improved device of the type characterized which can be readily standardized for use under a wide variety of conditions and vwhich is com- 5 posed of -relatively simple parts, which is easily manufactured, assembled and installed, and which is highly eicient in service. l

Other objects will appear as the descri ion of the invention proceeds. 10

This application is a continuation in part of my earlier application for 'Ihermostaticradiator valves, Serial No. 583,559, filed December 28, 1931. The invention is capable of receiving a variety of mechanical expressions, some of which are 15 illustrated on the accompanying drawing, but it is to be expressly understood that the drawing is for purposes of illustration only and is not to be construed as a deiinition of the limits of the invention, reference being had to the appended 20 l claims for that purpose.

Referring in detail to the accompanying drawing, wherein the same reference characters indicate corresponding parts in the several gures,

Fig. lis an axial section, somewhat schematic 25 in character, illustrating an embodiment of the present invention;

y Fig. 2 is an axial section of the unit of improved construction which it is preferred to use for subjecting the vaporizable liquid to the temperature 30 of the ambient; and

Fig. 3 is an axial section on a smaller scale of a construction oi.' valve mechanism with its motor vessel and associated parts suitable for use with high pressure steam. 35

In the form shown in Fig. 1, I0 designates a radiator or other heat exchanger of any suitable character and supplied with a heating medium ,A through inlet II, tail piece I2, tail nut Il, valve housing Il, and inlet conduit I5 connected to the 40 inlet of the housing Il by a coupling I8 of any suitable construction. Formed in or mounted on a partition I'I within the valve housing I4 is a valve seat I8 of any suitable size, construction and material for cooperation with a valve member I! 45 mounted as hereinafter explained. Said valve casing I I is closed by a cover member 20 of special construction as hereinafter described, said cover member being suitably retained on said casing Il as by a ring nut 2| oi known construction. 50

Supported from said member 20 in any suitable way and operatively connected to the valve member I9 is an expansible and collapsible motor vessel generally designated 22 which is subjected to the temperature of the heating medium owing 66 through the valve casing I4 and which constitutes a hot vaporizing chamber for a vaporizable liquid when injected thereinto as hereinafter described. As shown, motor vessel 22 is formed by an expansible and collapsible bellows-like tubular wall 23 having a stationary end wall 24 suitably attached thereto or formed integrally therewith. The opposite end of said ilexible wall 23 is suitably attached, as by brazing or soldering, to a ilange 25 formed on or attached to an end member 26 which has an elongated boss 21 projecting axially therefrom. Boss 21 is threaded at 28 to receive the valve member I9, and interiorly said boss is provided with an elongated cylindrical recess 29 for a purpose hereinafter explained.

Suitably mounted in member 20, as by a thread 30, is a tubular member 3l provided with a ange 32 by which the end Wall 24 may be clamped ilxedly to the member 20. At its opposite end said tubular member 3| carries a'flanged plug 33, said plug being extended to form an elongated guide member 34 preferably provided with a spherical extremity 35 of such an. exterior diam eter that it may slide freely with respect to the cylindrical recess 29 and thereby the rectilinear movements of the end member 26 with its supported valve member I9 are guided by said extension 34 during opening and closing of the valve, While binding is prevented, owing to the spherical extremity 35, in the event that through warpage, distortion, or otherwise, member 26 tends to move at a small angle with respect to the axis of the guide member 34, said guide member throughout the major portion of its length preferably being of a somewhat smaller diameter than the diameter of the recess 29.

Mounted on the member 3I and plug 33, and shown as clamped between the end of the former and the flange on the latter, is a spring seat 36 for a coil spring 31 that surrounds the member 3l and, at its opposite extremity, engages the inwardly directed ilange 38 of a tubular member 39 attached to the end member 26 in any suitable way, as by the bead 40. Spring 31 normally urges the member 39 toward the right, as viewed in Fig. 1, until the flange 38 engages the flange 32, and as the member 39 is attached to the end member 26, the motor vessel 22 is thereby normally maintained in its contracted relation, and the valve disk I9 is held away from its seat I8. When said motor vessel is expanded by the development of an internal pressure therein, as hereinafter explained, end member 26 may move to the left, as viewed in Fig. l, member 29 moving therewith to compress the spring 31 and flange 33 sliding on the tubular member 3 I. Thereby valve member I9 is caused to approach its seat I8 to the extent determined by the expansion of said vessel 22, up to the position where the disk I9 is seated to close the port in the valve seat I8.

To produce the aforesaidy expansion of the motor vessel 22 means are provided for predeterminately injecting small quantities of a Vaporizable liquid intosaid vessel where said liquid is vaporized by heat derived from the heating medium. To this end the tubular member 3|, which communicates with lthe interior of the vessel 22 as by one or more apertures 4I, leads to a chamber 42 in the member 20, and communicating with said chamber 42, and attached thereto in any suitable way as by a threaded thimble 43, is a tube 44, preferably exible, leading to a container for the vaporizable liquid and which is subjected to the medium to be controlled so that predetermined' quantities of liquid are injected into said motor vessel upon predetermined increases of temperature. v

In the form shown in Fig. 1 the container for supporting plates 41 and 48 on the .opposite side of the member 45. suitably secured to the plate 41 is a bracket or housing member 49 to which is suitably attached a stationary end member 50 of an expansible and collapsible vessel 5I, here shown as composed of a tubular, deeply `corrugated bellows-like exterior wall suitably attached, as by brazing or soldering, to a flange on the member 50 and having an opposite movable end wall 52 integral therewith or suitably attached thereto. End member 56 is secured within an aperture 53 in the bracket or housing member 49 in any suitable way, as by a coupling 54 and as shown, said end member carries a post 55 extended to a position whereby it will act as a stop to predetermine the maximum compression oi' the vessel 5I. End member 50 and post 55 are provided' with a passage extending therethrough in which is secured the end of the tube 44. Therefore, the interior of the vessel 5I is in communication through tube 44 with the motor vessel heretofore described. Mounted within said vessel 5I and cooperating with the opposed end walls thereof is a coil spring 56 which tends to hold said vessel in its most expanded position.

Suitably attached to the end wall 52, as by soldering or brazing, is a disk 51 provided with a helical periphery which is engaged with the interior screw threads provided on a sleeve 58 suitably attached to a rotatable plug 59. Projecting into an aperture in said plug 59 is an operating spindle 60, shown as attached to said plug by a set screw 6I, and mounted on the outer end of said stem 69 is a knob or handle 62, also shown as attached to said stem by a set screw 63. Plug 59 is rotatably mounted in an aperture in plate 41 but held against axial displacement as shown at 64. Therefore upon rotating knob 62 and stem 60, the plug 59 and interior sleeve 58 are rotated, and thereby the plate 56 is caused to advance along the screw thread of the member 58 to expand or contract the vessel 5I depending upon the direction of rotation of the knob 62. Stem is also rotatably mounted in an aperture in the plate 48 and is shown as provided with means 65 for alternatively limiting -the degree of rotation of said stem, or locking said stem against rotation, of the character disclosed and claimed in the application of William B. Mackintosh, Serial No. 583,531, filed December 28, 1931. A housing 66 through which the stem 60 projects encloses said means 65.

In order that a small range of temperature variation shall produce a predetermined volumetric change of the vaporizable liquid due to cubical expansion thereof and thereby effect the desired injection of vaporizable liquid into the vessel 22, it is desirable that a larger volume of said liquid be subjected to the temperature of the ambient than is conveniently supplied by a construction o" the type illustrated in Fig. 1. At the same time, said larger volume of vaporizable liquid should be subjected to the ambient under such conditions that there is little lag in the time required to cause the entire volume .of said liquid to respond to the change in temperature and thereby eiect the desired volumetric change due to cubical expansion. Furthermore, the distance from the motor vessel at sons of convenience of installation or because of the limits imposed by such location of said conj tainer as will cause it to respond properly to the temperature variations of the controlling ambient. is likely to vary within relatively wide limits, and at `the same time it is highly desirable that a device of this character be standarized and that nothing be done to the instrument after it has left the factory,` where it is properly charged and tested,- that will be likely to cause modification of or interference with the proper operation thereof. A preferred construction of container with mounting and adjusting means to meet these respective needs is illustrated in Fig. 2.

As here shown, the container for the Vaporizable liquid takes the form of a coiled tube-like bulb 10 which is preferably made of a diameter such that there is -little lag in the response of the contained liquid to changes of temperature in the air. Said tubular bulb 10 may be made of any suitable length so that the volume thereof will be suiilciently great to submit to the temperature of the ambient such a volume of the vaporizable liquid that the percentage of change in volume, per degree change in temperature, is adequate to eii'ect the desired injection of said liquid into the motor vessel. Thus in Fig. 2 said tubular bulb 10 is shown of such length that it is coiled through approximately 540, but this obviously may be considerably varied, depending upon the volume of liquid desired. the diameter of the tubular bulb, the desirable diameter of the coil to maintain the preferred compactness of unit. etc. Tubular bulb 10 is shown as provided with a illling tube 1| proiecting from one end thereof, which tube may be pinched and sealed in any suitable way after the filling operation has been eifected. Projecting from the opposite end of the bulb is a tube 12 leading'to and suitably sealed into an opening 18 in T-shaped coupling 14. Sealed into the opposite opening 15 of said coupling is a flexible tube 18, corresponding to the tube 44 of Fig. 1 but here shown as having a substantial length coiled at 11 within a chamber 18 provided at the rear of a housing 19 and having` .its end 80 leading to a motor vessel of any suitable construction.

`Housing 19 is attached in any suitable wav. as by rivets 19', to a flange 8| which may be secured to any 1suitable support as by screws 82. Housing 19 has supported therein in any suitable way. as by a shoulder 83. a partition or bracket 84 which constitutes the bottom of the chamber 18. Chamber 18 is made of such size that when the unit being described is mounted as near to the motor vessel as it is likely to be desired in practice all of the excess tubing. whose length is such as to provide for the most remote location of said unit likely to be found in practice, can be coiled in said chamber 18. Any suitable means may be provided for retaining the tube in its coiled relationship in the chamber 18. As shown, a readily removable and preferably ilexible cover plate 88 is suitably attached to a stationary part of the structure, as the housing for the adjusting mechanism hereinafter described, by a screw 88. Bracket or partition 84 may also carry suitable means for supporting the tubular bulb in position. As shown, strips 81 are suitably attached to said bracket or partition 84, as by rivets 88, and have their ends 89 bent substantially at right angles to the body thereof, said ends 89 being shaped to provide curved seats adapted to engage the periphery of the tubular bulb at each of the respective coils thereof.

Housing 19 has its forwardly projecting portion 99 of sumcient size so as to house the tubular bulb 19 and the adjusting mechanism to be described. and the periphery of said housing is provided with apertures 9| so as to provide for the free ingress and egress of air to and from said bulb. l

Supported within the housing in any suitable way is a tubular bracket or casing element 92 which is apertured or slotted at 98 to receive the stem of the T-shaped coupling 14. Extending through the stem of said T-shaped coupling is a passage 95 which communicates with the passage connecting the pipesection 12 and 18, said passage 98 also communicating at.its inner end with an expansible and collapsible vessel 5| which. as here shown, is of the same construction and provided with adjusting means of the same character as heretofore described in detail in conjunction with the embodiment of Fig. l, the same reference characters being applied thereto to designate the corresponding parts.

Fig. 3 illustrates a valve and motor vessel operatively connected thereto and suitably associated therewith for use where high pressure steam is the heating medium. The valve casing |00 has suitable inlet and outlet passages |0| for the heating medium, and disposed within said casing is a balanced valve |02 of any suitable construction. Operatively connected to said valve |02 is a valve stem |03 which projects through the aperture |04 provided in a bonnet member |05 suitably attached to the valve casing as by the threaded connection |06. Said valve stern |03 extends through a suitable packing device |01 and has its outer end suitably connected, as by a threaded connection |08, to a post |09 operatively associated with the movable end wall ||0 of an expansible and collapsible motor vessel iii, here formed by a relatively rigid cup-shaped exterior wall ||2 and an expansible and collapsible corrugated tubular wall I i3 suitably attached to said movable end wall at one end, as by brazing or soldering, and suitably attached at its opposite end, as by brazing or soldering, to a flange member ||4 which in turn is secured to said cupshaped wall ||2, as by brazing or soldering. The chamber is in communication through passage i5 with a tube ||6 which, for example, may bean extension of the tube 44 in Fig. 1 or of the tube 80 in Fig. 2. Mounted between a flange |1 on a collar ||8 suitably secured in the relatively open end of the cup-shaped wall I2, and a spring seat ||9 associated with movable end wall ||0,

is a coil spring |20 which normally tends to ex- In this embodiment, owing to the high tempera.'-

ture existing where high pressure steam is used the motor vessel ||3 is not subjected directly to the temperature of the steam but is' mounted in heat conducting relation with parts subjected to the temperature of the steam, said vessel being disposed at such a position with respect to the high temperature parts with intermediate heat conducting members oi such construction and material that the motor vessel is maintained at the desired temperature when the high pressure steam is ilowing through the valve casing |00. As shown, a generally L-shaped bracket |22, which may be formed of a brass casting, ha. an annular' base portion |23 which may be clamped to thebonnet member |00 by the nut |24, and a tubular portion |25 Within which the outer wall H2 of the expansible and collapsible chamber I is secured in any suitable way. Heat is therefore transferred to the motor vessel l Il by conduction from the bonnet member |05 through the bracket |22 to the wall of said motor vessel. Said vessel and its bracket are preferably provided with an enclosing casing |26 which may be supported on the bonnet member |05 in any suitable way as by a ange thereon, and said housing has a suitable aperture |21 through which the tube H6 extends.

In operation the container for vaporizable liquid is subjected to the temperature of the ambient and the liquid therein varies in volume by cubical expansion in conformity with the changes in the temperature of the ambient. If the temperature of the ambient rises the expansion of said liquid causes the injection of predetermined quantities of said liquid into the hot vessel, Where itis vaporized and produces an expansion of said vessel by reason of the increase in pressure therein, moving the valve member toward closed position. If the temperature of the ambient decreases, the liquid in the container exposed to the ambient contracts, thereby decreasing the pressure in the motor vessel and withdrawing some of the vapor therefrom into the communicating tubing where it is condensed, this operation continuing until the readjustment of pressure in the motor vessel corresponds with the contraction of the liquid in the container. Thereby the position of the valve member is adjusted with respect to the temperature existing at the container for vaporizable liquid and an accurateregulation of temperature is effected. 'I'he temperature to be maintained can be predetermined by adjusting the container itself, in the embodiment of Fig. 1, or the reservoir for the liquid in communication with the tubing, in the embodiment of Fig. 2, so that a greater or less expansion of the liquid is required before the predetermined injection of liquid into the motor vessel takes place.

It will therefore be perceived that the present invention provides means whereby a container for vaporizable liquid in communication with a relatively hot motor vessel which constitutes a vaporizing chamber for said liquid may be subjected to the temperature of the ambient under conditions wherein the amount of vaporizable liquid injected into said hot motor vessel is nicely controlled by the temperature of the ambient. Moreover, means have been provided whereby the volume of liquid so subjected to the temperature of the ambient may be made relatively large and yet the container therefor is of such character that the entire volume of said liquid may respond promptly to changes in the temperature of the air while, at the same time, the container is of compact construction. 'I'he present invention also enables the apparatus to be standardized with such a length of communicating tubing as is likely to be necessary for the most remote location of the container from the motor vessel while at the same time said container may be positioned relatively close to the motor vessel without modifying the structure or vinterfering with the condition of adjustment oi the apparatus as it leaves the factory Means have also been provided whereby a hot motor vessel can be employed withl high pressure steam. Provision has also been made for the ready and accurate adjustment of the temperature by varying the extent to which said vaporizable liquid must be expanded to effect the desired injection into the hot motor vessel. The structure illustrated and described is composed of relatively simple parts which can be manufactured and assembled in quantities without the use of highly skilled labor and therefore the device is economical to manufacture. Moreover, the unit designed to be mounted on an exposed surface Within the room or other compartment whose temperature is to be controlled is simple and compact in construction and of a character not to be objectionable either because of its appearance or because of danger of injury thereto because of projections, delicate parts, etc.

While the embodiments illustrated on the drawing have been described with considerable particularity, it is to be expressly understood that the invention is not restricted thereto. Various other embodiments thereof will now readily suggest themselves to those skilled in the art, while changes may be made in the details of construction, arrangement, proportion and material of the parts, and certain features used without other features, Without departing from the spirit of the invention. Reference is therefore to be had to the appended claims for a definition of the limits of the invention.

What is claimed isz- 1. In a temperature regulator for heat exchangers, in combination with valve mechanism for controlling the flow of a heating medium, an expansible and collapsible motor vessel subjected to the temperature of said heating medium and operatively connected to said valve mechanism, means containing a vaporizable liquid responsive to changes in temperature of themedium to be controlled for injecting predetermined quantities of said vaporizable liquid into said hot motor vessel, said means including a coiled elongated tube constituting a container for said volatile liquid a housing for said container, a partition in said housing providing a storage compartment separated from the compartment in which said container is subjected to the medium to be controlled, and a long flexible conduit connecting said con.- tainer and vessel and adapted to permit said container to be positioned relatively remote vfrom said vessel, said conduit adapted to be coiled in said compartment when said container is to be positioned at a distance from said vessel which is less than the length of said conduit.

2. In a temperature regulator for heat exchangers, in combination with valve mechanism for controlling the flow of a heating medium, an expansible and collapsible motor vessel subjected to the temperature of said heating medium and y operatively connected to said valve mechanism, a

container for a vaporizable liquid responsive to changes in temperature of the medium to be controlled and adapted to inject predetermined quantities of said vaporizable' liquid into said hot motor vessel, a relatively long ilexible conduit communicating with said vessel and said container, and a housing for said container providing a chamber in which said conduit may be coiled when said container is positioned at a distance from said vessel which is less than the length of said conduit, said chamber being separated from the chamber tobecontrolled. 4 v 3. In a temperature' regulator for heat exchangers, in combination with valvemecha'nis'm `for controlling the ow of aheating medium, an

expansible and collapsible motor vessel subjected to the temperature of said heating .medium and operatively eonnectedto said valve mechanism. a container for a vaporizable liquid responsive to changes in temperature of the ambient and subjecting a substantially constant volume of said liquid to said ambient temperature, said container adapted to inject predetermined quantities of said vaporizable liquid into said hot motor vessel, a support for said container, a conduit in communication with said container and vessel, an expansible and collapsible reservoir for said liquid mounted on said support and in .communication with said conduit, and means for expanding and contracting said reservoir to vary the volume of said liquid in said conduit and thereby the amount of expansion oi' liquid in said container required to effect injection into said motor vessel.

4. In a temperature regulator for heat exchangers.. in combination with valve mechanism for controlling the fiowvof a heating medium, an expansible and `collapsible motor vessel subjected to the 'temperature of said heating medium and operatively connected to said valve mechanism, means containing a vaporizable liquid responsive to changes in temperature of the ambient for injecting predetermined quantities of said vaporizable liquid into said hot motor vessel, a support for said container, said means including a relatively rigid coiled elongated tube for subjecting a substantially constant volume of -said liquid to the ambient, a conduit communicating with said container and said vessel, an expansible and co1- lapsibie reservoir for said liquid mounted on said support concentrically with the coil of said container, said reservoir being in communication withsaid conduit, and means for expanding and collapsing said reservoir to vary the amount of liquid in said conduit and thereby the expansion of said liquid required to effect injection of said liquid into said vessel.

5. In a temperature regulator for heat exchangers, in combination with valve mechanism for controlling the ow of a heating medium, an expansible and collapsible motor vessel subjected to the temperature of said heating medium and operatively connected to said valve mechanism, means for subjecting a substantially constant volume of vaporizable liquid responsive tochanges in temperature of the ambient and thereby injecting predetermined quantities of said vaporizable liquid into said hot motor vessel, said means including a coiled tubular bulb lled with said liquid, en expansible and collapsible container for said liquid around which said bulb is coiled, a conduit in communication with said bulb, said container and said vessel, said container adapted to vary the volume of said liquid in said conduit, and means for expanding and contracting saicllcontainer.

.6. In a tem rature regulator for heat exchangers, in combination with valve mechanism for controlling the ow of a heating medium, an expansible and collapsible motor vessel subjected to the temperature of said heating medium and operatively connected to said valve mechanism, meanscontaining a vaporizable liquid responsive to changes in temperature of the medium to be controlled ior injecting predetermined quantities of said vaporizable liquid into said adapted to lbe position'edrelatively remote from -saia vessel, a tube coiled within messing/and constituting a. eontamerifor ma uquidfano a flexible conduit of standardized length communicating with said container and said vessel. Bald casingproviding a chamber inwhichthe'excess length of said conduit may be coiled when said conduit is longer than the distancebetween said casing and said vessel.

7. In a temperature regulator for heat exchangers. in combination with valve mechanism for controlling the flow. ota heating medium, an expansible and collapsible motor vessel subjected to the temperature o! said heating medium and operatively connected to said valve mechanism, means containing avaporizable liquid responsive to changes in temperature of the medium to be controlled for injecting predetermined quantities oi said vaporizable liquid into said hot motor vessel, said means including a casing adapted to be positioned relatively remote .from said vessel, an elongated tubular container for said liquidvcoiied within said casing, a exible conduit of standardizedlength connecting said container and said vessel and adapted to have the` excess length ythereof coiled within said casing when said conduit is longer than the distance between said vessel and said casing, and means for holding said coiled conduit in said chamber.

a support for said container, .a conduit connecting said container and said vessel, and means mounted on said support and associated with but separated from said container casing for varying the amount' of liquid in said conduit without varying the size of said container and thereby varying the amount of expansion of said liquid required to effect an injection into said vessel.

9. In a temperature regulator for heat exchangers, in combination with valve mechanism for controlling the ow of a heating medium, an expansible and collapsible motor vessel subjected to the temperature of said heating medium and operatively connected to said valve mechanism, a coiled tubular container for subjecting a substantially constant volume of a vaporizable liquid to changes in temperature of the ambient and adapted to inject predetermined quantities of said vaporizable liquid into said hot motor vessel, a casing for said container, a flexible conduit con- 40 said vaporizable liquid into said hot motor vessel,

necting said container and said vessel, and means "changers, in eombmauoniwitn valve mechanism lfor varying the ilow of heating medium, an ex#- pansibl'e and collapsible motor vessel operatively connected to said valve and subjected to the temperature of said heating medium, whereby said vessel constitutes a vaporlzing chamber for a vaporizable liquid, liquid-containing means for subjecting a substantially constant volume oi said vaporizable liquid to the temperature oi the ambient and including means for varying the 4degree of cubical expansion of said liquid required to effect an injection oi liquid into said motor vessel without varying the volume of said liquid subjected to said temperature by said liquid-containing means, said last-named means beingassociated with but separated from said liquid-containing means and including an expansible and collapsible container for said liquid, and means for expanding and contracting said container.

11. In a temperature regulator for heat exchangers, in combination with a valve casing and valve mechanism therein for controlling the now o! a heating medium through said exchanger, an 4expansible and collapsible motor vessel operatively connected to said valve mechanism, means for mounting said vessel outside of said valve casing, said mounting means constituting a conductor of heat from said valve casing to said vessel whereby said vessel is maintained at a predetermined temperature below that of said heating medium by heat conducted thereto from said heating medium and constitutes a vaporizing chamber for a vaporizable liquid, a container for said vaporizable liquid adapted to he mounted in a position relatively remote from said vessel and to inject predetermined quantities of said liquid thereinto, and a conduit connecting said container and vessel.

12. In a temperature regulator for heat exchangers, in combination with a ,valve casing and valve mechanism. therein for controlling the flowA of a heating medium through' said exchanger. an expansible and collapsible motor vessel having an inilexible tubular exterior wall and operatively connected'to said valve mechanism, a metallic bracket in heat conducting relationship with said exterior wall of said motor vessel andmounted exteriorly of said valve casing in heat conducting relationship therewith whereby said vessel is maintained at a predetermined temperature below that of said heating medium by heat metallically-conducted to said vessel through said bracket and said vessel constitutes a vaporizing chamber for a vaporizable liquid, a container for said vaporizable liquid adapted to be positioned relatively remote from said vessel and to inject predetermined quantities of said vaporizable liquid into said vessel upon predetermined increases of temperature in the medium to which said container is subjected, and a conduit connecting said vessel and said container.

JEAN V. GIESLER. 

